package com.shadow.study.quartz.common.utils;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Component;

/**
 * Spring Context工具类.
 * @version v1.0
 * @className: SpringContextUtils
 * @author: Pbody
 * @date: 2021/1/28 10:48
 */
@Component
@Scope("singleton")
public final class SpringContextUtils implements ApplicationContextAware {

    /**
     * Spring应用上下文环境.
     */
    private static ApplicationContext applicationContext;

    private SpringContextUtils() {
    }

    /**
     * 实现ApplicationContextAware接口的回调方法，设置上下文环境.
     * @param applicationContext 上下文环境
     * @throws BeansException BeansException
     */
    @Override
    public void setApplicationContext(final ApplicationContext applicationContext) {
        SpringContextUtils.applicationContext = applicationContext;
    }

    /**
     * 获取ApplicationContext.
     * @return ApplicationContext
     */
    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }

    /**
     * 获取对象.
     * @param name bean名称
     * @return Object 一个以所给名字注册的bean的实例
     * @throws BeansException BeansException
     */
    public static <T> T getBean(final String name) {
        return (T) applicationContext.getBean(name);
    }

    /**
     * 获取类型为requiredType的对象.
     * @param clz 参数类对象
     * @return T
     * @throws BeansException BeansException
     */
    public static <T> T getBean(final Class<T> clz) {
        return applicationContext.getBean(clz);
    }

    /**
     * 如果BeanFactory包含一个与所给名称匹配的bean定义，则返回true.
     * @param name 名称匹配的bean
     * @return boolean
     */
    public static boolean containsBean(final String name) {
        return applicationContext.containsBean(name);
    }

    /**
     * 判断以给定名字注册的bean定义是一个singleton还是一个prototype.
     * 如果与给定名字相应的bean定义没有被找到，将会抛出一个异常（NoSuchBeanDefinitionException）
     * @param name 名称匹配的bean
     * @throws NoSuchBeanDefinitionException Exception
     */
    public static boolean isSingleton(final String name) {
        return applicationContext.isSingleton(name);
    }

    /**
     * 获取类型.
     * @param name 名称匹配的bean
     * @return Class 注册对象的类型
     * @throws NoSuchBeanDefinitionException NoSuchBeanDefinitionException
     */
    public static Class<?> getType(final String name) {
        return applicationContext.getType(name);
    }

    /**
     * 如果给定的bean名字在bean定义中有别名，则返回这些别名.
     * @param name bean名字
     * @return String[]
     * @throws NoSuchBeanDefinitionException Exception
     */
    public static String[] getAliases(final String name) {
        return applicationContext.getAliases(name);
    }
}
